drm_panel_prepare(9)

📦 version 7.3.1, in nixpkgs unstable

💅 drm_panel_prepare(9) — like, the actual kernel API manual, bestie

Okay so real talk, this is page drm_panel_prepare(9) from the Kernel API Manual and it's honestly shorter than my attention span, which is saying something. Let's get into it 🫶

✨ NAME ✨

drm_panel_prepare — power on a panel. That's it. That's the whole name section. Iconic minimalism, no notes 💅

🌸 SYNOPSIS 🌸

void drm_panel_prepare (struct drm_panel *panel );

Note the void — this function does not return anything, so don't come looking for an error code, bestie, there isn't one 😌

🎀 ARGUMENTS 🎀

  • panel — your DRM panel. The panel in question. The main character of this whole operation 👑

🦋 DESCRIPTION 🦋

So what does it actually do? Calling this function will enable power and deassert any reset signals to the panel. Basically it wakes the panel up and takes its little reset line out of timeout. Slay.

Once that's done, it's possible to communicate with any integrated circuitry via a command bus — so after this, the panel's actually listening, iykyk ✨

Now for the part you gotta remember: this function cannot fail. Not "probably won't", not "rarely does" — cannot. Why? Because it gets called from the pre_enable call chain, and there's just no room for failure energy in there. So don't go checking for a return value that doesn't exist 🙈

And one more thing — there will always be a call to drm_panel_disable afterwards. Always. It's giving commitment issues but in a reliable way 💜

🌈 SEE ALSO 🌈

The kernel file lives at ./drivers/gpu/drm/drm_panel.c, and here's the whole friend group:

Fr fr, read the related pages before you go poking at panel power. Your display will thank you 🍓

That's the whole vibe check! This page hangs out in ./drivers/gpu/drm, dated October 2026, and honestly? She ate. Periodt 💖✨

📦 where this page comes from